Re: [kvm-devel] [ANNOUNCE] kvm-guest-drivers-windows-2

[Dor L. <dor...@qu...>]

On Wed, 2008-05-14 at 17:49 +0200, Tomasz Chmielewski wrote:
> Dor Laor schrieb:
> 
> (...)
> 
> >> - PV Windows (network driver)
> > 
> > About 700Mb+-, there is currently extra copy that we need to omit.
> > Thanks for Anthony, we just have to change the driver.
> > 
> >> - non-PV Windows
> > 
> > What do you mean? Other fully emulated nics like e1000?
> > It does not perform as pv but depending on the guest it can do up to
> > 600Mb+-.
> 
> Just generally, how Windows PV drivers help to improve network performance.
> 
> So, a PV network driver can do about 700Mb/s, and an emulated NIC can do about 
> 600 Mb/s, Windows guest to host?
> 
> That would be about 20% improvement?
> 
> 

It's work in progress, doing zero copy in the guest, adding TSO, using
virtio'd tap will drastically boot performance. There is no reason the
performance won't match Linux guest.
Also I don't exactly remember the numbers but the gain in the tx pass is
grater.